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Analysis of Transient Noise Behavior of a Truck Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 30, 2001 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Based on NVH tests conducted on a heavy-duty turbocharged DI diesel engine, noise relevant differences between steady-state and transient operating condition were investigated. A vehicle drive-by test simulating the effects of vehicle mass and inertia was performed, followed by transient NVH measurements in a semi-anechoic test cell.
Steady-state noise was exceeded by 5 dBA during transient operation due to broadband increase of noise excitation combined with structure resonance amplification. Transient noise results mainly from “harsher” combustion as a consequence of enlarged ignition delay indicated by significant increase in maximum cylinder pressure gradient. Variation of geartrain excitation and combustion excitation revealed that geartrain noise is of minor importance in this context.
Transient noise improvement must focus on reducing ignition delay, for instance by increasing combustion chamber temperature, optimization of injection rate (controlling the amount of premixed fuel at start of combustion) and advancing begin of injection in compliance with adequate NVH and excellent drivability.
Transient tests should be implemented in the diesel engine NVH development process, since steady-state parameter variations do not reflect the individual transient NVH behavior of the engine.
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CitationDhaenens, M., van der Linden, G., Nehl, J., and Thiele, R., "Analysis of Transient Noise Behavior of a Truck Diesel Engine," SAE Technical Paper 2001-01-1566, 2001, https://doi.org/10.4271/2001-01-1566.
Data Sets - Support Documents
|Unnamed Dataset 1|
- Leipold F. W. Herzog W. (Noise Reduction Technologies on Modern Trucks)
- Moser F. X. Spessert B. (Development of Low-Noise Diesel Engines for Truck and Industrial Application)
- Schittler M. Bergmann H. Flathmann K. The new Mercedes-Benz OM 904 LA Light Heavy-Duty Diesel Engine for Class 6 Trucks SAE 960057
- Reinhart T. Test Cell Simulation of the Drive by Noise Test SAE 870967
- Boland T. Huang J. Flint W. Vehicle Pass-By Exterior Noise In-Cell Simulation Test Method SAE 951358
- Rust A. Thien G. Effect of Transient Conditions on Combustion Noise of NA-DI Diesel Engines SAE 870989
- Watanabe Y. Fujisaki H. Tsuda T. DI Diesel Engine Becomes Noisier at Acceleration - The Transient Noise Characteristic of Diesel Engine SAE 790269
- Head H. E. Wake J. D. Noise of Diesel Engines Under Transient Condition SAE 800404
- Challen B. J. The Effect of Combustion System on Engine Noise SAE 750798